Question: What is the length of an arc of a circle with a radius of 10 cm and a central angle of 45°?

Options:

1. 5π cm
2. 10π/4 cm
3. 10π/8 cm
4. 10π/2 cm

Correct Answer: 10π/4 cm

Solution:

Arc length = (θ/360) * 2πr = (45/360) * 2π(10) = (1/8) * 20π = 10π/4 cm.